We present a novel, quantum interferometric method of performing quantum state tomography of two-qubit photonic mixed states. The method does not require detecting one of the photons and therefore allows covering of wider spectral ranges.

Frontiers in OpticsJan 1, 20240 citations

Advances in atomic, molecular, and optical physics

Photonic State Tomography

Joseph B. Altepeter, Evan R. Jeffrey, Paul G. Kwiat

Published Jan 1, 2005• 368 citations

Publisher

DOI: 10.1016/s1049-250x(05)52003-2

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We propose and demonstrate a method for quantum-state tomography of qudits encoded in the quantum polarization of

N

-photon states. This is achieved by distributing

N

photons nondeterministically into three paths and their subsequent projection, which for

N=1

is equivalent to measuring the Stokes (or Pauli) operators. The statistics of the recorded

N

-fold coincidences determines the unknown

N

-photon polarization state uniquely. The proposed, fixed setup manifestly rules out any systematic measurement errors due to moving components and allows for simple switching between tomography of different states, which makes it ideal for adaptive tomography schemes.